fuzz/corpus2array: fix build with gnu89
Just a simple compilation fix. GCC 4.8.5 does not default to gnu99 or gnu11.
Checklist
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Code modified for feature -
Test suite updated with functionality tests -
Test suite updated with negative tests -
Documentation updated
Reviewer's checklist:
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There is a test suite reasonably covering new functionality or modifications -
Function naming, parameters, return values, types, etc., are consistent with other code -
This feature/change has adequate documentation added -
No obvious mistakes in the code
Edited by Rosen Penev